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Regression Analysis, A Linear Relationship could be A Simple Linear Regression Model, Quantitative and Qualitative variables can have A Nonlinear Relationship, Regression Analysis studies relashionships among Quantitative and Qualitative variables, A Nonlinear Relationship could be A Simple Linear Regression Model, A Linear Relationship could be A Multiple Linear Regression model, A Nonlinear Relationship could be A Multiple Linear Regression model, Quantitative and Qualitative variables can have A Linear Relationship